Pyrometer



Dec. 13, 1932. A. F. SPITZGLASS ET AL PYROMETER Filed Dec. 20. '1928 2Sheets-Sheet 1 Dec- 13, 1932- A. F. SPITZGLASS ET AL 1,390,701

PYROMETER Filed Dec. 20. 1928 2 SheetsShee 2 Patented Dec. 13, 1932UNITED s'rA ALBERT F. SPITZGLASS AND OTTO T. HANDWERK, OF CHICAGO,ILLINOIS, ASSIGNORS TO REPUBLIC FLOW METERS COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION OF ILLINOIS s rynomnrnn.

Application filed December 20, 1928. 7 Serial No. 327,223.

This invention pertains to recording instruments, and more particularlyto pyr0meters adapted for the control of heating units or the like.

It is well known that there are various devices adapted for temperature,heat or other conditions control in large furnaces, heating plants andthe like, but such devices are usually'very complicated due to the powernecessary for operating mechanism incident to control such conditions."One form of such heat control device is the pyrometer, and in thepyrometer as well as in other control, it is of course desirable, wherepossible, to have a direct operation from the device itself, but it hasnot been practical before to commercially utilize direct operation froma pyrometer due to the large currents necessary to be handled, as thereis arcing, especially in breaking contacts to shut ofi the currentflowing to the heating plant, which arcing rapidly destroys the pointsof the switch control; or where valve, switch or the like operation isnecessary, not enough power can be developed in conjunction withapparatus used in sensitive work. I

In order to adapt the pyrometer for heavy duty work, it must be made tofulfill two requirements; namely, continuous operation (on outgoingeffect), and the powerto opcrate a heavy control. There are somepyrometers on the market in which operation is continuous; that is, forinstance, when the switch control is closed, it remains closed until tis reversed. The difficulty however with this form of pyrometer is thatoperation is directly oil? the pointer or index, and as the system isnecessarily very delicate, such pyrometer does not have the power tooperate heavyapparatus. Again, there are no pyrometers on the market inwhich operationis such that it is possible to get anywhere near theamount of power out ofthe control as is gotten in the device which isthe subjectmatter of the present application, even with those wherepower-is sought to be obtained "at the expense of continuous operationwherein the switch once closed remains closed for only a very shortperiod. On th s account it is necessary to compensate for this movementby the use of a specialtype of relay which will operate in the short.period of time and keep the switch closed until the conditions arereversed. This is objectionable in-that the complete device for the heatcontrolis very complicated.

It is then desirable to obtain a device which is an improvement over oneemploying mere continuous operation and one which is powerful enoughthough operated from a sensitive pointer, and also to obtain a devicewhich will be a combination of these features; that is, will operatefrom a very sensitive movement, yet at the same time will give greatpower, in fact, power asgreat as desired, and that without ati'ectingthe sensitivity, and at the same time the arrangement to be such thatthe effect of this power may be continu ous on whatever mechanism itisdesired to operate.

It is therefore an object of this invention to provide a control of themillivoltmeter, galvanometer or the like device type for recording orindicating and controlling conditions such as temperature of a heatingmedium or unit.

Another objectis to provide a selective device whereby a predeterminedtemperature can be maintained constant at a point remote from saiddevice.

Still another object is to provide a device for controlling temperatureof heating I plants, units or the like, the device being such that aplurality of adaptations are possible as well as unlimited powercontrol:

Yet another object is to provide a pyrometer which is of continuousoperation (on out- 4 going effect) and adapted for heavy duty switch,valve or the like operation.

. I A further object is to provide a pyrometion which can have its valueor characteristic determined.

An additional object is to provide a device for indicating andcontrolling conditions, the operation of which must be very delicate andsensitive in order to give accurate determination.

Still additional object is to provide a control device for controllingand/or indicating varying or constant conditions.

Another additional object is to provide a device adapted for conditioncontrol, said device being operated from any or a sensitive movement.

A further additional object is to provide a device of long life anduniversal application, and one which fulfills all requirements ofmanufacture and service.

Still further additional object is to pro- 20,vide a device forcontrolling remote conditions, which device is automatic of operation.

Yet further additional object is to provide a device for controllingremote conditions, which device is continuous in operation and isoperated to automatically clutch and declutch with means for affectingsaid remote conditions to thereby maintain said conditions inpredetermined status.

With these and various other objects in view, the invention may consistof certain novel features of construction and operation, as will be morefully described and particularly pointed out in the specification,drawings and claims appended hereto.

In the drawings, which illustrate an embodiment of the device andwherein like reference characters are used to designate like parts,

Figure 1 is a fragmentary sectional perspective elevation, more or lessdiagrammatic, of a pyrometer which is the subject matter of thisinvention; showing the clutch mechanism in operative position;

Figures 2 to 5 inclusive are diagrammatic representations of thedepressor and associated mechanism, showing the relative positionsthereof during various degrees of operation of the device; i Figure 6 isan enlarged elevation of a portion of the positive clutch device;

Figure 7 is a more or less diagrammatic elevation, showing thepyromet-er adapted for heavy duty work. said pyrometer being used tocontrol an electrical switch connected to a furnace. heating unit; and

Figure 8 is a more or less diagrammatic elevation, showing the pyrometeradapted for heavy duty work, said pyrometer being used to directlyoperate valves of a fluid furnace. Referring firstof all moreparticularly to Figures 1 to 6 inclusive, it will of course beunderstood that the pyrometer herein described is suitably housed asindicated in Figures 7 and 8, and presents a scale 20 convenientlylocated and calibrated so that temperature or other conditions to becontrolled may be read by reference thereto and to the pointer or index22. Said pointer or index 22 is preferably movable with respect to saidscale and is connected to a galvanometer,

millivoltmeter or the like armature 24,

mounted for oscillation, the same being conbeing preferably in alignmentwith the axis of the armature 24, said yoke being provided withdepending arms 32 to which a depressor 34 and a holder 36 are pivoted asat 38. The holder may take the form of a supporting arm 40 pivoted tothe yoke 28 as at 38, said arm 40 being provided with a member 42adapted to overlie and normally contact the index or pointer 22 tomaintain the same in fixed position with reference to the scale 20.

The arm 40 is provided with a pin or member 44 overlying the forwardlyextending portion 46 of the depressor 34, said pin 44 being adapted tobe engaged by the portion 46 on the upward movement of said portion toraise the member 42 out of engagement with the index 22. The end of theportion 46 is provided with an angularly disposed index engaging portion48, the same being so proportioned that it engages the pointer onlywithin small limits, said portion 48 having an extension 50-so arrangedas to prevent the depressor from falling off of the index after it isonce engaged. The depressor pivoted at 38 is provided with a rearwardlyextending arm 52 which is an extension of the arm 46. Said arm 52 isadapted to be contacted by one arm '54 of a bellcrank 56, said bellcrankbeing pivoted as at 58 and provided with a depending arm 60 having a camengaging roller 62 pivoted thereto. The roller 62 engages a suitable'cam64 mounted on a shaft 65, said shaft being rotated by a power drivendevice 66 either directly or through suitable gearing 68. Said powerdriven device may take the form of a motor, turbine, Diesel engine, gasengine. clock or any other prime mover, and may be of either thecontinuous or intermittent type. c I

The shaft 65. which is a driving shaft and is associated with the drivenshaft 66 preferably aligned with said driving shaft, is adapted to beintermittently connected therewith through clutch mechanism 68. Theclutch 68 is of the positive type, and as shown consists essentially ofa plate or supporting member 70 secured to the driving shaft. The platemember 70 extends radially from the as at 86 to the head of the hook 72,a spring 88 being secured to the pivot 82, and the plate 70 urging thepivot 82 toward the plate. It will be noticed that the pivot point 82 iswithin the straight line connecting the pivots 80 and 86 "and toward theaxis of the shaft 64 so that a positive locking connection is normallymaintained for the hook 72. The hook 72 is adapted to have engagementwith an arm 90 of the crank 92, which is secured to the driven shaft sothat when the ledge 76 of the hook 72 is in engagement with the crank92,- the driving shaft may impart rotation to the driven shaft.

A selector 94 is pivoted at 96-at a point adjacent the clutch plate andslightly biased with respect to the shaft 65, the selector taking theform of a substantially triangular plate having a notched portion 98adapted to straddle the shaft 65, the selector :being provided withupper and lower pins inember 106 is pivoted as at 108 at a pointadjacent the cam 64 and is provided with shoulders 110 and 112, shoulder110 being adapted to have cooperative engagement with a trip pin 114disposed on the cam 64, and shoulder 112 being adapted to have loekingengagement in a plurality of positions with the pin 104 disposed on theselector 94.

Referring to Figure 7, the pyrometer 200 in this case is-adapted forheavy duty in that operation may be effected by means of a motor andreduction gear train 202. In this case an electric heating apparatus 204is provided with a suitable thermocouple 206 connected through theconductors 208 with the pyrometer for indication of temperature cot1(litions by means of the polnter orindex 222 and scale 220. The operatedshaft 266 is provided with a' crank arm 210 connected through the link212 with one arm of a bellcrank 214 of the snap switch 216, the otherarm 218 of the bellcrank being connected through resilient connection201 with crank 203 operating the switch members .or arms in seriesbetween the source of supply 207.

and the resistor 209 of the heating apparatus,

suitable conductors 211 being used. In operation then, actuation of theshaft 266 by the pyrometer serves to open and close the switch arms 205,disconnecting or connecting the source of supply 207 with the resistor209, thereby controlling the temperature of the heating apparatus 204. I

Referring now to'Figure 8, as before the pyrometer 300 is adapted forheavy duty work, employing the motor and reduction gear train 302. Thegas or oil heating apparatus 304 is provided with a suitablethermocouple 306 connected to the pyrometer through the conductors 308.The thermal changes in this heating apparatus are efi'ected through thefluid valves 301 and 303 for controlling the flow of fluid to theinjector 305. In this case, the shaft 366 is provided a thermocouple isconnected through suitable conductors to operate the armature 24, whichin .turn operates the pointer 22, it being understood of course thatwhen the holder member 40 is in contact with the pointer 22, saidpointer cannot be moved, but when the holder member 40 is raised fromthe pointer, said pointer is free to be moved by the armature, saidmovement depending upon the conditions of the furnace or unit to becontrolled.

Assuming that ,the power unit 66 is of continuous operation, it will benoticed that said unit is connected through suitable gearing with theshaft 65, rotating same at a predetermined rate, rotation of this shaftcausing rotation of the cam 64, in turn actuating the bellcrank 56 tomove the arm 54 to move the depressor 34, movement of the depressor 34serving to raise and lower the holder member 40 out of and intoengagement with the index 22.

The index 22, it will be noticed, is oscillated through the armature 24which in turn is con trolled through connections, such as theconnections 208, from a thermocouple, such as thermocouple 206, it beingunderstood that the thermocouple is associated with the heatingapparatus and is affected by the change of heat therein. Assuming thatheat is being supplied to the furnace, yet the temperature is below thatwhich is necessary so that heat ure 2.

. a 94 will have been locked in its upper position there will be nomovement of said selector of movement of a portion of the lever 78 andmust continue to be supplied, the current con- Figure 2, the operationof which already has trolling the armature 24 will cause the index beendescribed.

22 to move out of the path of movement of the In Figure 5, it will benoticed that while depressor 34, in which case the rotation of theclutch is bein rendered inoperative, the the cam 64 will operate thebellcrank 56 and selector is locked by means of the latch 106 in turnthe depressor so that the depressor though on each cycle the latch isreleased, yet will pass the index 22, such as shown in Figthe biasedposition of the plate will prevent Under these conditions, the selectorunauthorized movement of said selector, and

by the latch 106, the ledge 112 engaging the pin 10% of the selector.

Rotation of the cam by the shaft 65 will lector to the positionillustrated in Figure 2. cause the pin 114 to raise the lock 106 so thatIt is only after the temperature of the heatthe ledge 112 is renderedinoperative with re ing apparatus is lowered sufiiciently to move spectto the pin 10 1 of the selector. The arm the index out of the path ofmovement of the 60 of the bellcrank however will cause the sedepressorthat the selector is moved to its lector to remain in upper positionwhere the ,upper position whereby the latch 7 2 engages pin 102 of theselector is in the path of movethe arm 90 to move the shaft 66 to turnon ment of the lever 7 8 of the clutch so that rothe heat control means.The arm 90 is moved tation of the clutch member 7 0 will cause the to aposition as illustrated in Figure 2, when outstanding portion of lever 78 to contact pin the lever 7 8 contacts pin 102 to release the 102, suchas illustrated in Figure 3, thereby clutch to thereby complete the cycleof operabreaking the toggle, operating the link 84 tion of the control.to move thehook 7 2 to a position where it will It is to be understoodthat we do not wish not engage the arm 90 of the crank 92 so that to belimited by the exact embodiment of the as the depressor is not loweredsufficiently due no rotation can be imparted to the driven. deviceshown, which is merely by way of shaft this operation continuing so longas illustration and not limitation, as various and the index 22 does notinterrupt the movement other forms of the device will of course be ofthe depressor, It will be se'en that r0taapparent 1301311088 skilled inthe art WltllOllt tion of the shaft causes latching and unlatchdepartingfrom the spirit of the invention ing of the selector, causing theselector to reor the scope of the claims. I main constantly in itsuppermost position. lVe claim: However, when the temperature is raisedsuf- 1. In a control device, the combination of ficiently, the index 22will be operated to an operating shaft, an operated shaft, means move toa position where it will interrupt for connecting said shafts includinga clutch, the movement of the depressor, such as shown said clutchincluding links for disengaging in Figure 4, in which case the pin 114on the aid clutch, said links normally resisting decam 6; willengage'the lock 106 to raise said c utching operation. lock to releasethe selector which up to this 2. In a control device, the combination oftime has been locked in its upper position, rotary shafts, means forconnecting said such as illustrated in Figures 2 and 3. The shafts,control means fOI' determining the opselector then being biased will bepermitted emtiOIl 0f S id means for connecting said to move to theposition illustrated in Figure f s, nd m hanical means on one of said l,as the depressor is interrupted so that the S fis e l ec lng operationof said control selector is not kept in its upper position, in m a whichcase the pin 10-0 is disposed in the path 3. In a control device, thecombination of rotary shafts, a clutch for connecting said the pin 102will be moved out of the path of Shafts, a member p i g d ch th lever 78to control the connection of said shafts, means Movement of the drivingshaft 65 will Operable y one Said Shafts for Controlling cause the latch72' to engage the arm 90 of movement of Sald member, and Sensltlve thecrank 92 to rotate the driven shaft to thereby shut off or diminish themean-s for controlling thermal changes to the heating apparatus. Theshafts revolve until the lever I 4 In a control devie for reoulafingther i i z gfi i m J lgure mal conditlons 1n heatmg apparatus and theiii 0 L h re easmg engage" like, the combination of an index movable bymen Ween e i and the a galvanometer controlled by a thermocouple andthls operation will continue, that 1s, there Connection from Saidheating apparatus a F be no engagement between t11e 1atch and holder forcontacting said index to maintain the crank, until the temperature 1slowered id i d i i ti positions an Oscip sufficiently so that the indexno longer interl t bl depressor di d dj t id i last named means foroperating said clutch n relatlon to said medium.

means responsive to variations in a controllable medium for effectingoperatlon of said rupts movement of the depressor when the dex, the pathof movement of said depressor parts assume the position as illustratedin intersecting the path of movement of said index, a pin carried bysaid depressor engageable with said holder for moving said holder out ofcontact with said index, a rotatable driving shaft constantlyoperated bya prime mover, a cam on said shaft, a bellcrank disposed adjacent saidcam and having an arm engageable with and following said cam, saidbellcrank having another arm engaging with and actuating said depressor,a driven shaft axially aligned with said driving shaft and having aclutch member including a crank thereon, a cooperating clutch devicecarried .by said driving shaft an including a radially disposedsupporting member fixed to said driving shaft, a latch member pivoted tosaid supporting member at a point removed from the shaft axis, saidlatch member being disposed to have engagement with said crank, a levermember pivoted to said supporting member at a point removed from saidshaft axis and so disposed that said shaft axis is between the pivotpoint of said lever and said latch member, a connection pivoted to saidlever and said latch,

" the pivot point of said latch and lever being disposed within the linejoining the pivot point of said lever and thepivot point of saidconnection and latch and contacting said supporting member whereby saidlatch may be positively locked in crank engaging position, a resilientmember connected to said supporting member and the pivot point betweensaid a leverand connection whereby the latch member is urged to crankengaging. position, a

selector disposed adj acent said shaft and having members adapted to bedisposed in the able with the cam engaging arm of said bell path of saidlever member to thereby move the latch to inoperative position wherebythe driving shaft is declutched from the driven shaft, said selectorhaving a member engagecrank to control movement of said selector,

a latch member for said last named selector member, a member on said camfor controlling said latch, connecting means between said driven shaftanil thermal control means of said heating apparatus whereby when saidindex does not interrupt movement of said depressor the last named latchis tripped and the cam, engaging arm of said bellcrank operates saidselector so that theclutch is operative whereby the driving shaftoperates the driven shaft to move the thermal control means to increasethe thermal conditions of said heating apparatus until one of the firstnamed members on said selector moves the clutch member to declutchedposition rendering the driven shaft inoperative to operate the thermalcontrol means, operation of said thermal means remaining unchanged untilthe index is moved to interrupt movement of said depressor whereby thecam engaging arm of said bellcrankmoves the selector to posi-' tionwhereby the clutch device is operative to connect said shafts wherebythe thermal 0011- K trol means is moved to decrease thermal conditionsuntil the index again is moved out of the path of said depressor.-

5. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating apparatus, a movabledepressor'disposed adjacent said index, the path of movement of saiddepressor intersecting the path of movement of said index, a rotatabledrivingshaft, means disposed on said shaft for operating said depressor,a driven shaft, a clutch device for selectively connecting said drivingand said driven shafts, and a selector disposed adjacent said shaft andbeing operatively connected by said first named means whereby thedriving shaft may be declutched from the driven shaft.

6. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index, a rotatable drivingshaft, means associated with said driving shaft and depressor for movingsaid depressor, a driven shaft, a clutch disposed between said drivingand said driven shafts for selectively connecting said shafts, aselector disposed adjacent one of said shafts and provided with meansfor selectively controlling the clutch, said selector being providedwith a member controlled by said first named means to control theposition of saidvselector, and a member controlled by said means formaintaining the selector in positions depending upon the position ofsaid index.

7. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index whereby the position ofsaid index determines the movement of said depressor, a rotatabledriving shaft, means associated with said shaft and depressor forimparting movement thereto, a driven shaft for controlling thermalcontrol means of said heating apparatus, connecting means between thesaid shafts for selective connection thereof, and means controlled bysaid first named means for controlling said connecting means betweensaid shafts.

8. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index whereby the position ofsaid index determines the movement of said depressor, a constantlyoperating driving shaft, means associated with said driving shaft andsaid depressor for controlling movement of said depressor, a drivenshaftfor controlling thermal control means of said heating apparatus, aclutch device disposed between said shafts for selectively connectingsaid shafts,- and means controlled by said first named means forcontrolling the operation of said clutch.

9. In a control device for regulating thermal conditions in heatingapparatusand the like, the combination of an index movable according tothermal conditions in said heat ing apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index whereby the position ofsaid index determines the movement of said depressor, a. constantlyoperating driving shaft, means associated with said driving shaft andsaid depressor for controlling movement of said depressor, a drivenshaft for controlling thermal control means of said heating apparatus,.aclutch device disposed depressor, a constantly operating driving shaft,means associated with said driving shaft and said depressor forcontrolling movement of said depressor, a driven shaft for controllingthermal control means of said heating apparatus, a clutch devicedisposed between said shafts for selectively connecting said shafts, andmeans operable by said first named means depending upon the position ofsaid index for controlling the operation of said clutch. c

11. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index whereby the position ofsaid index determines the movement of said depressor, a constantlyoperating driving shaft, means associated with said driving shaft andsaid-depressor for controlling movement of said depressor, a drivenshaft for controlling thermal control means of said heating apparatus, aclutch device disposed between said shafts for selectively connectingsaid shafts, means operable by said first named means for controllingthe selective operation' of said clutch, and a member cooperating withsaid last named means for locking the same in operative positionsdependent upon the positions of said index.

12. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in-said heating apparatus, a movable depressordisposed adjacent said index, the path of movement of said depressorintersecting the path of movement of said index, a rotatable drivingshaft, means disposed on said shaft for operating said depressor, adriven shaft, a clutch device for selectively connecting said-drivingand said driven shafts, and a clutch operating member for selectivelyclutching and declutching said clutch device.

13. In a control device for regulating thermal conditions in heatingapparatus and the like, the combination of an index movable according tothermal conditions in said heating 'apparatusya movable-depressordisposed adjacent, said index, the path of movement of said depressorintersecting the path of movement of said index, arotatable drivingshaft, means disposed on said shaft for operating said depressor, adriven shaft, a clutch device .for selectively connecting said drivingand said depressor, a driven shaft, a clutch device for selectivelyconnecting said driving and said driven shafts," and a clutch operatingmember operated by said driving shaft and controlled by said index forselectively clutching and declutching said clutch device.-

15. In a control device, the combination of a continuously operateddriving shaft, a

driven shaft, a clutch for positively connecting said shafts, saidclutch including .an arm lla' carried by one of said shafts and a latchcarried by the other shaft for interlockingwith said arm, links forholding said latch in latching position, said links normally resistingunlatching of said latch.

16. In acontrol device, the combination of an operating shaft, anoperated shaft, means for connecting said shafts including a'clutch,said clutch comprising'a member 011 one of said shafts, a second memberon the other of said shafts for engaging the first named member, andmeans normally holding said second shafts, said means including normallyinterengaging parts carried by said shafts, said parts normally biasedto interengaging position, and means controlled by said index forcontrolling said connecting means to selectively effect operation ofsaid driven shaft.

18. In combination with a movable index, mechanism including a memberbeating across the path of the index and adapted to be interceptedbysaid index in certain positions thereof, a driving shaft for operatingsaid mechanism, a driven shaft, means for positively connecting saidshafts and means cont-rolled by the coaction and non-coaction of saidmember and index for controlling the connecting means to selectivelyeffect operation of the driven shaft.

19.. The combination with a movable pointer and a member to becontrolled in accordance with the deflection of said pointer,

of means cooperating with said pointer in cer-' tain' positions thereof,a driving means for operating sald first named means, driven meansconnected with said member for con trolling operation thereof,interlocking means between said driving and driven means and controlledby said first named means to selectively effect operation of saidmember.

20. In a control device, the combination of an operating shaft, anoperated shaft,clutch members carried by each shaft and normally inengaging position, a selecting member for declutching said clutchingmembers and means operated by said operating shaft for holding saidselecting member in position during the declutching operation.

21. Ina control device, the combination with rotary shafts, of clutchmembers carried by said shafts and normally in clutching po-.

sition, a selector having means for declutching said clutch members at aplurality of points in their travel, and means for holding said selectorin a plurality of positions to effect declutching operation of theclutch to cause a partial revolution of the driven shaft.

22. A control device, having in combination, rotary shafts, clutchmembers carried by said shafts, and a plurality of meansfor cooperationwith said members to declutchthe same and arranged so that at least oneof said means is always in position to declutch said members whereby oneof said shafts makes only apartial revolution at each operation.

23. A control device, having in combination, a driven and a drivingshaft, an arm carried by one of said shafts, a clutch member carried bythe other shaft, a latch on said member for engagement with said arm,atrip lever pivoted to said member and a link connecting one end of saidtrip lever and said latch, the pivot of said link and trip lever beingnormally to one side of a straight line between the pivot of the leverand the pivot of the link with the latch, and means for tripping saidtrip lever to retract said latch from its arm engaging position. v

24:. In a control device, the combination of a continuouslyoperateddriving shaft, a driven shaft, a clutch member on each shaft, one, ofsaid members provided with an arm, the other of said member carrying alatch adapted to engage said arm and also carrying a lever and a linkconnecting one end of said lever and said latch, said lever and linknormally resisting declutch-ing action of the latch and a trip adaptedto engage the free end of'the lever to retract said latch and stop thedriven shaft. c

25. In a control device, the combination of an operating shaft, anoperated shaft, an arm carried by said latter shaft, a clutch membercarried by the other shaft and including a latch member adapted toengage said arm,

a lever and a link connecting one end of the lever. and latch andadapted to'resist retraction of the latch, a trip member for co0perationwith said lever tp retract said latch to prevent engagement thereof withthe arm, and means for holding said trip member in tripping position.

26. A control device, having in combination, two revolvable shafts,clutch members carried by each shaft and normally in clutching position,and including a trip lever for declutching said members, a selectorprovid- -ed with a plurality of arms for engagement with said trip leverto selectively trip said lever whereby said driven shaft is rotated onlya partial revolution at each operation, a latch for holding saidselector in tripping position and means operated by said driving shaftfor releasing said latch whereby said selector is freed to take up atripping position.

27. tion, two revolvable shafts, clutch members carriedby each shaft andin clutching position, and including a trip for declutching saidmembers, a selector provided with arms disposed on opposite sides of oneof said,

shafts and so arranged that the trip engages one or theother of saidarms at each revolution to cause a partial revolution of one of saidshafts, and means for holding said selector in one or the other of itstripping positions, said latter means operated by one of said shafts andadapted to release said selector when the trip is intermediate saidarmsand to reengage and hold it in tripping position.

controldevice, having in combina-.

28. A control device-having in combina tion, an index responsive tovariations in the value of a quantity to be controlled, a membercooperating with said index and controlled thereby, a driving shaft foroperating said member, a driven shaft, clutch members carried by saidshafts and normally in clutching position including a tripping levercarried by one of said members, a selector provided with a plurality ofarms, at least one of which is disposed in position to trlp said tripmember to disengage said clutch members to cause a partial revolution ofthe driven shaft, operating means for the selector whereby its positionis determined by said first named member, means for holding saidselector in one or the other of its positions, and means operated bysaid driving shaft for momentarily releasing said holding means topermit said selector to take up a position 1n accordance with theposition of said first named member whereby the operation of the drivenshaft is selectively controlled.

29. In a control device, the combination of rotary shafts, cooperativeclutch members carried by said shafts, a selector provided with meansfor operating said clutch members at points in the travel thereof, andmeans for selectively niaintaining said selector in positions to effectoperation of at least one of said clutch members whereby movement of oneof said shafts is effected. v

30. In a control device, the combination of rotary shafts, normallyclutched cooperative clutch members carried by said shafts, a selectorprovided with means for declutching said clutch members at selectedpoints in the travel thereof, and means for selectively maintaining saidselector in positions to effect deolutching operation of at least oneof said clutch members whereby movement of one of said shafts iseffected.

31. In a control device, the combination of rotary shafts, normallyclutched cooperative clutch members carried by said shafts, a selectorprovided with means for declutohing said clutch members at selectedpoints in the travel I thereof, and means for selectively maintainingsaid selector in positions to effect operation of at least one of saidclutch members whereby movement of one of said shafts is effected.

p 32. In a control device, the combination of rotary shafts, normallyclutched cooperative tor provided with means fdr declutching said clutchmembers at selected points in the travel thereof, and means forselectively maintaining said selector in positions to efiect declutchingoperation of at least one of said clutch members whereby a partialrotary movement of the driven shaft of saidshafts occurs. I

Signed at Chicago, Illinois, this 12th day of December, 1928.

ALBERT F. SPITZGLASS.

OTTO T. HANDWERK clutch members carried by said shafts, a selectorprovided with means for declutching said clutch members at selectedpoints in the travel thereof, and means for selectively maintainlng saidselector in positions to effect declutching operation of at least one ofsaid clutch members whereby a partial rotary movement of one of theshafts occurs.

33. In a control device, the combination of rotary shafts, normallyclutched cooperative clutch members carried by said shafts, a selec-

